Invalid-bedstead



(No Model.)

A. J, GOODWIN.

INVALID BEDSTEAD. No. 249,924. Patented Nov. 22,1881.

WIVTNESSES: INVENTOR:

&u/pw BY i ATTORNEYS.

NITED STATES PATENT OFFICE@ ASAHEL J. GOODWIN, OF BROOKLINE,MASSAGHUSETTS.

.INVALI D-BEDSTEAD.

SPECIFICATION forming part of Letters Patent No, .249,924, datedNovember 22, 1881.

Application filed March 10, 1881. (No model.)

To all whom 'it may concm Be it known that I, ASAHEL J. GOODWIN, ofBrookline, in the county ot' Norfolk and State of Massachusetts, haveinvented a new and useful Improvementin Invalid-Bedsteads, of which thefollowing is a specification.

Myimprovements relate to the devices used for raising and lowering thehinged sections of invalid-bedsteads, and have for their object toobtain great power by Conveniently-operated mechanism.

The invention consists in a raek and pinion combined with a cani onwhich the hinged seotion is supported; also,in a pawl for retaining theparts in position against downward pressure, all as hereinafterdescribed and claimed.

The accompanying drawing is a sectional side view of the head portion ofa bedstead having my invention applied.

A is the side rail, B the head-board, and O the hinged or pivotedsection of the bed-bottom, which may he ot' any suitable construction. i

D is the cam, hung on a stud, a, or shatt that is attached to the railA, and having its upper side made of suitable shape. b is afriction-rollattached to section U and resting on the cam D. The central portion ofthe cam D is cut out or slotted, and the outer side of the slot is'o'med as a rack, c, curved in the arc ot' a circle, having its centerat the stud or shaft e.

In the rail A is fitted a short arbororshaft, d, on which is fixed apinion, c, that meshes with the rack c. Outside the rail the arbor d isformcd to receive a crank-landle. A pawl, f, hung on rail A, engages thepinion e in a manner to prevent backward movement of the pinion bypressure on the cam.

lt will be seen that power applied to turn the pinion is eXerted on thecam at a distance from the center, so that when the section is firstmoved, the roller b being near the stud a, the greatest power is exertedto raiseit; Then, as the cam rises, the roller moves outward on the cam,and the motion increases in rapidity proportionate to the decrease ofweight on the cam occurring by increased inelination of the section C.

At the heel of the cam there is a stud or pin, '5, having an enlargedhead for connection of the rod that passes in the usual manner to thecam that acts on the lower or foot section of the bed, as shown anddescribed in my application for a patent on invalid-bed, filed December18,1880, so that both sections shall, when foot is depressed, be movedsimultaneously.

Byconnecting the rod k directly to the cam, instead of to an arm on across-shaft carrying the cani, the mechanism is rendered more simple andconvenient.

There maybe two cams, D, placed on a crossshait for raising the sectionC.

I do not limit myself to the rack formed at the inside ot' a slot in acam, as it may be at the outer edge of the cam, and the pinion placed tocorrespond.

It will he observed that the greatest power is obtained exactly whereitis needed-namely, at the first movement, and when the whole weight isdirectly upon the eccentric. As the bed rises the weight lessensnecessarily, and, less power being then needed, the devices are arrangedto act more rapidly. During the movement the friction-roll b crosses theline of the pinion e, thus actually changing the order of the leverage.

What I claim as new is 1. As an improvement in means for raising thehinged sections of invalid-bedsteads, the eccentric lever D, formed withrack c and pinion e, in combination with the hinged section G, providedwith t'riction-roll b, substantially as shown and described.

2. The combination, with the hinged section G, of eccentric D, pinion e,rack c, pawl f, and friction-roll b, the latter fixed on the section andhearing on the eccentric, substantially us and for the purpose setforth.

ASAHEL JEWEL GOODWIN.

Witnesses:

GEO. D. WALKER. C. SEDGWICK.

